app_timeline_post.rb

class CustomLogParser
  # ... previous code for CustomLogParser
  def single_timeline(ip)
    info = Hash.new(0)
    @data.each do |d|
      next unless d[:ip] == ip
      time = d[:time].strftime("%B %m, %Y")
      info[time] += 1
    end
    info
  end
end

# ... previous code for app.rb

post '/timeline' do
  @ip = params[:ip] # def not gunna be any XSS or anything lol
  @single_timeline = parser.single_timeline(params[:ip])
  erb :timeline
end